Testing device



July 31, ,1923 `1,463,440

s. PICHLER TESTING DEVICE Filed July 26. 1922 550 36 .lo A 3;,0 eo

(G3 a I Q @i D vo ygi. 12

Patented July 3l, 1923.

narran stares insane satana" corsica TESTING DEVICE.

Y Application inea July 26, i922'. serial No. 577,652. i

To @ZZ 'whom t mayconccrn. f p

Be it known that I, .STEPHEN PIGHLER, a citizen of the United States of America, residing at Detroit, in the county of 1Wayne and State of Michigan, have invented certain new and useful Improvements in rliestn ing Devices, of which the following is a specification, reference being had therein to the accompanying drawings.

In my Patent o. 1,890,55a, granted Sept. 13, 1921, there is disclosedja cam .gauge or instrument of precision for testing inaccuracies in cams, eccentrics and other structures or articles having curvilinear surfaces. The gauge or instrument included a plurality of pins adapted to be interposed between the cam and a defined surface, the position of the pins at different places on the surface of the cam indicating whether such in lieu of the multiplicity of pins. Just as ne measurements can be made with the micrometer and its support permits ofv it being easily and quickly shifted relative to a cam surface and the grooves or calibrations of my testing device.

My improvement will be hereinafter described by aid of the drawingwherein,

Figure 1 is a plan of the gauge or testing device, and l F ig. 2 is a cross sectional view of the same.

As in my former device there is a suitable su pport 1, as a work bench or horizontal portion of a machine, which is provided with a f plurality of sockets 2 having an accurate defined relation to a socket 3. Mounted in the sockets 2 are the feetor pegs 4 of a graduated scale plate 5 having a large central circular opening 6 with the walls thereof perfectly true and smooth. The upper face cf the plate 5 may be graduated or calibrated, as in my former device, but forthe purpose of explaining this improvement I have simply shown degree graduations 7.

Mountedfin'the socket 3 is a post l.or rotary pin 9 provided with an interchangeable coli larlO which vbears upon the support 1 and it is on this collar that a cam or other article 11 may be placed, about the post 9, and held by a nut 12 or other holdfast device mounted on the post. A l

Slidable about the marginal edges of the opening 6 is a support or bracket 17 having a depending ledge or rib 13 extending `into the opening 6 and against the wall thereofV s o that said wall will guide the support or bracket when shifting it on the plate 5. EX- tending outwardly in a radial direction from the support or `bracket 17 is a pointer 14 eX- tending to the degree graduations 7 of the plate 5.

Mounted in the upper end of the support or bracket 17 is a conventional form 'of miciometer 15 having a pin or adjustable mem-v Y ber 1 6 extending inwardly from the support or bracket 17 in a radial direction to contact with the surface 8 of the cam 11 and by setting the micrometer for a predetermined measurement between the camV surface and Y l the wall 6 the support or bracket 17 can be shifted to a desired degree mark to ascer-V tain if the cam surface, at this particular degree mark, is accurate, relative to the wall 6. If it is not accurate the micrometer can be easily adjusted to ascertain how much out the cam surface may be, and in this manner 'any inaccuracies in' the cam surface can be,

discovered and either rectified or the cam discarded before it is placed in use.

When the plate 5 is provided withad- Y ditional graduations I may use the radial finger orv member disclosed in my prior patent, and I may use other means, than herein disclosed for supporting the cam or any article in a defined location relative to the plate 5. F or this and other reasons I do not care to confine my invention to a construction cther than defined bythe appended claims.

W'hat I claim is 1. Means for ascertaining the inaccuracies of a curvilinear surface onra piece of work comprising a plate having graduationsand an opening to receive the piece `of work,

Lmeans for holding the piece of work in a defined position relative to the wall of the plate opening, and means having a constant radial relation to the piece of work and slidable on and circumferentially of the marginal edges of the plate opening, and

adjustable to and from the axis of the plate opening adapted to engage the piece of Work and permit of an inaccuracy in the Qiecey of Work being ascertainechusail means includ- 'ino a winter eveiluino' said 'alate and movaa b l ble relative to the graduationsv'elieieof.

'2. Means for ascertaining the inaccuracies of a curvilinear surface-'0n a piece of Work, as called for in claim l, wherein the last nientionedlnieans inludes a Ybracket and a micrometer'in the upper end of said'bracket.

3. Means i501"l ascertaining therinaccuracies of a curvilinearl surface on a piece of work, as called` for in claim l, wherein the last mentioned means includes a bracketancl an 15 adjustable pin in Vsaid bracket.

In .testimony whereof I affix my signature in presence vof two Witnesses. Y

' Y VSTEPIJHLN PICHLER.

Witnesses:

KARL H. IVUTLE-R,VV ANNA M. Donn. 

